Review of Physical Based Monitoring Techniques for Condition Assessment of Corrosion in Reinforced Concrete

Abstract

Monitoring the condition of steel corrosion in reinforced concrete (RC) is imperative for structural durability. In the past decades, many electrochemistry based techniques have been developed for monitoring steel corrosion. However, these electrochemistry techniques can only assess steel corrosion through monitoring the surrounding concrete medium. As alternative tools, some physical based techniques have been proposed for accurate condition assessment of steel corrosion through direct measurements on embedded steels. In this paper, some physical based monitoring techniques developed in the last decade for condition assessment of steel corrosion in RC are reviewed. In particular, techniques based on ultrasonic guided wave (UGW) and Fiber Bragg grating (FBG) are emphasized. UGW based technique is first reviewed, including important characters of UGW, corrosion monitoring mechanism and feature extraction, monitoring corrosion induced deboning, pitting, interface roughness, and influence factors. Subsequently, FBG for monitoring corrosion in RC is reviewed. The studies and application of the FBG based corrosion sensor developed by the authors are presented. Other physical techniques for monitoring corrosion in RC are also introduced. Finally, the challenges and future trends in the development of physical based monitoring techniques for condition assessment of steel corrosion in RC are put forward.

Weld Overlay Technique using Different Filler Rod Size to Overcome Internal Corrosion of Low Carbon Steel Base Metal

“…Weld overlay is commonly used to repair components such as pipes, valves and vessel mostly in oil and gas industries. Shielded Metal Arc Welding (SMAW) are commonly used to perform overlay welding in industries but for some cases other types of welding process can be use such as Gas Metal Arc Welding (GMAW) [2][3][4].…”

Numerical Simulation of Monitoring Corrosion in Reinforced Concrete Based on Ultrasonic Guided Waves

“…Compared with the electrochemistry based approaches, these physical approaches can not only provide supplemented tools for monitoring steel corrosion, but also conduct more accurate condition assessment of steel corrosion. Recently, the authors presented a review of some physical based monitoring techniques for condition assessment of corrosion in reinforced concrete in the past decades [ 5 ].…”

“…Among the current available physical monitoring techniques, the technique based on ultrasonic guided wave (UGW) is popular due to the advantages for monitoring corrosion related damage in reinforcing bars, so it has gained popularities in the recent years [ 5 ]. However, one difficulty of guided wave based technique for monitoring corrosion in reinforced concrete is the limitation of monitoring range for certain modes and frequencies [ 5 , 6 ]. Unlike guided wave propagation in other multilayered systems, such as a metal pipeline in air, wave energy in steel bars embedded in mortar or concrete is lost (i.e., attenuated) at high rates due to leakage into the surrounding concrete.…”

Effects of Concrete on Propagation Characteristics of Guided Wave in Steel Bar Embedded in Concrete

“…Among the current available corrosion monitoring techniques in reinforced concrete, the technique based on ultrasonic guided wave has gained more and more popularity in the recent years due to its advantages for monitoring corrosion related damage in reinforcing bars, so it has gained popularities in the recent years [18]. Na et al [19] used both high (1 MHz) and low frequencies (150 KHz) to study the effect of various bond levels by surrounding the rebar with a polyvinyl chloride polymer (PVC) pipe in RC beams and the effect of debonding location on the received waveforms.…”

“…There is difference in the propagation characteristics of guided waves between the free steel bars and the steel bar surrounded by concrete. However, the research on the effects of concrete on propagation characteristics of guided wave in steel bar embedded in concrete is less reported, because there is a difficulty of limitation of monitoring range of guided wave in reinforced concrete [18,27]. Unlike guided wave propagation in other multilayered systems, such as a metal pipeline in air, wave energy in steel bars embedded in concrete, will be reduced (i.e., attenuated) at high rates due to leakage into the surrounding concrete.…”